Granted Patent
Utility
US 4,684,352 · App. 06/817,698
Method for producing a composite spark plug center electrode
Inventors:
Ronnie W. Clark, Dale P. Ameling
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Jan 13, 1986
Inventors
Ronnie W. Clark
Dale P. Ameling
Assignee (at issue)
Champion Spark Plug Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.